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Investment in Unconsolidated Entities - Income from Investments in Unconsolidated Entities (Details) - Equity Method Investments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Autumnwood Investments LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	$ 0	$ 265	$ 260
200 RHC Hoover, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	0	275	1,370
BBA-EP320 II, LLC, BBA-Ten10 II, LLC, and Lexington on the Green Apartments, LLC (collectively)
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	1,050	996	433
RiverBanc LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	0	0	125
Kiawah River View Investors LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	0	0	1,250
RB Development Holding Company, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	0	0	107
RB Multifamily Investors, LLC. [Member]
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	0	0	2,262
Morrocroft Neighborhood Stabilization Fund II, LP
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	1,131	1,591	910
Evergreens JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	4,312	571	199
Bent Tree JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	0	1,795	411
Summerchase LR Partners LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	0	569	380
Lake Mary Realty Partners, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	0	2,745	554
The Preserve at Port Royal Venture, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	1,778	1,729	834
WR Savannah Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	1,854	1,386	692
Somerset Deerfield Investor, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	251	0	0
RS SWD Owner, LLC RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, and RS SWD Saltzman Owner, LLC (collectively)
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	76	0	0
Audubon Mezzanine Holdings, L.L.C. (Series A)
Schedule of Equity Method Investments [Line Items]
Changes in fair value, income	$ 59	$ 0	$ 0

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612

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